Xurkitree having access to z hypno, tail glow and grass/ice coverage moves warrants a quick ban imo. Guessing between scarf/z hypno set can cost you the game as evidenced in the replay below. Its simply too much for the UU metagame

Pigeotite or whatever its called also deserves a suspect. Theres not very many counters to it in this tier, coupled with a strong stab that has 0 drawbacks. Boosting moves such a workup also allow it to be a potent sweeper. It also has a great speed tier of 121 while having access to u-turn allows it to switch out of blissey (one of its only counters). It has trouble with weavile (as does torn-t) but i still think it deserves a suspect as weavile is priority weak, and easily worn down by hazards.

After playing around with Xurkitree a bit, I agree that it needs to be looked at. I've been using an Electrium Z set with Electric Terrain (Z-Electric Terrain boosts Speed 1 stage), Thunderbolt, Energy Ball, and Hidden Power Ice, and this set can snowball quickly after a KO thanks to Beast Boost. There isn't much that wants to switch into this apart from maybe Blissey. Due to Xurkitree's base 83 Speed, it can be revenge killed by faster Choice Scarf users and Mega Aerodactyl with Earthquake (not a guaranteed OHKO if Xurkitree is at full health though).